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<TITLE>JavaScript Source Code 3000:  Forms:  Validation (Num. or Chars)</TITLE>
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<META NAME="date" CONTENT="2000-09-09">
<META NAME="channel" CONTENT="Web Developer">
<META NAME="author" CONTENT="JavaScript Source Code 3000">
<META NAME="section" CONTENT="Forms">
<META NAME="description" CONTENT="Validates an input field to make sure that only a number or character is entered.  If you enter a number or a letter everything you can continue on.  But, try entering another value like an exclamation point (!), an ampersand (&), or a dollar sign ($) and see what happens.  It even highlights the incorrect entry field for you.  Nice!">

<SCRIPT LANGUAGE="JavaScript">




<!-- Begin
function validate(field) {
var valid = "abcdefghijklmnopqrstuvwxyz0123456789"
var ok = "yes";
var temp;
for (var i=0; i<field.value.length; i++) {
temp = "" + field.value.substring(i, i+1);
if (valid.indexOf(temp) == "-1") ok = "no";
}
if (ok == "no") {
alert("Invalid entry!  Only characters and numbers are accepted!");
field.focus();
field.select();
   }
}
//  End -->
</script>
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<A HREF="../index.htm" /" TARGET="_top"><FONT COLOR="#0000FF"><b>Home</b></font></A>
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<A HREF="index.htm" /forms/" ><font color="#FF0000"><b>Forms</b></font></A>
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<FONT COLOR="#006666"><b>Validation (Num. or Chars)</b></font></font>
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<!-- Description --><!--content_start-->
Validates an input field to make sure that only a number or character is entered.  If you enter a number or a letter everything you can continue on.  But, try entering another value like an exclamation point (!), an ampersand (&), or a dollar sign ($) and see what happens.  It even highlights the incorrect entry field for you.  Nice!
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<!-- Demonstration -->
<center>
<form onSubmit="if(this.entry.value!=''){alert('The field validated successfully!');return false;}else{alert('Please fill out the field!');return false;}">
<input type=text name="entry" onBlur="validate(this)">
<br>
<input type=submit value="Submit Form">
</form>
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<tr><td BGCOLOR=yellow><font FACE="helvetica,arial,geneva"><b>JavaScript Source Code 3000:  Forms:  Validation (Num. or Chars)</b>
<p>Simply click inside the window below, use your cursor to highlight the script, and copy (type Control-c or Apple-c) the script into a new file in your text editor (such as Note Pad or Simple Text) and save (Control-s or Apple-s).  The script is yours!!!
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<tr><td BGCOLOR=yellow ALIGN=CENTER>
<form NAME="copy">

<DIV align="center">
<input type=button value="Highlight All" onClick="javascript:this.form.txt.focus();this.form.txt.select();">&nbsp;&nbsp;&nbsp;&nbsp;
<INPUT TYPE="text" NAME="total" VALUE="Script Size:  1.13 KB" size=24>
</DIV>

<textarea NAME="txt" ROWS=20 COLS=75 WRAP=VIRTUAL>

&lt;!-- TWO STEPS TO INSTALL VALIDATION (NUM. OR CHARS):

  1.  Copy the coding into the HEAD of your HTML document
  2.  Add the last code into the BODY of your HTML document  --&gt;

&lt;!-- STEP ONE: Paste this code into the HEAD of your HTML document  --&gt;

&lt;HEAD&gt;

&lt;SCRIPT LANGUAGE="JavaScript"&gt;

&lt;! &gt;
&lt;! &gt;

&lt;!-- Begin
function validate(field) {
var valid = "abcdefghijklmnopqrstuvwxyz0123456789"
var ok = "yes";
var temp;
for (var i=0; i&lt;field.value.length; i++) {
temp = "" + field.value.substring(i, i+1);
if (valid.indexOf(temp) == "-1") ok = "no";
}
if (ok == "no") {
alert("Invalid entry!  Only characters and numbers are accepted!");
field.focus();
field.select();
   }
}
//  End --&gt;
&lt;/script&gt;
&lt;/HEAD&gt;

&lt;!-- STEP TWO: Copy this code into the BODY of your HTML document  --&gt;

&lt;BODY&gt;

&lt;center&gt;
&lt;form onSubmit="http://your-web-site-address-here.com/script.cgi"&gt;
&lt;input type=text name="entry" onBlur="validate(this)"&gt;
&lt;br&gt;
&lt;input type=submit value="Submit Form"&gt;
&lt;/form&gt;
&lt;/center&gt;

 

&lt;!-- Script Size:  1.13 KB --&gt;</textarea><br><font FACE="helvetica,arial,geneva"></font></td></tr>

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